1999634 has 16 divisors (see below), whose sum is σ = 3691968. Its totient is φ = 790992.

The previous prime is 1999633. The next prime is 1999651. The reversal of 1999634 is 4369991.

It is a super-2 number, since 2×1999634² = 7997072267912, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1999591 and 1999600.

It is not an unprimeable number, because it can be changed into a prime (1999631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5312 + ... + 5675.

It is an arithmetic number, because the mean of its divisors is an integer number (230748).

2^1999634 is an apocalyptic number.

1999634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1999634 is a deficient number, since it is larger than the sum of its proper divisors (1692334).

1999634 is a wasteful number, since it uses less digits than its factorization.

1999634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11009.

The product of its digits is 52488, while the sum is 41.

The square root of 1999634 is about 1414.0841559115. The cubic root of 1999634 is about 125.9844190022.

The spelling of 1999634 in words is "one million, nine hundred ninety-nine thousand, six hundred thirty-four".